We use the Marquis, Mecke, Mandelin, folin, Froehde, Lieberman, Simon, and Erlich reagents for testing (pictured below). These reagents work by reacting with substance to give one of several characterized reactions. We also use fentanyl test strips to test for the presence of fentanyl and it’s analogs. Fentanyl is a powerful synthetic opioid that has recently been found in many samples of drugs. It cannot be detected by the chemical reagents alone.

Dance Safe provides 8 chemical reagents for substance checking. (Simon’s reagent not pictured)

The resulting color change can indicate the presence of certain substances. Our tests cannot indicate purity or concentration – simply the presence or lack of specific substances.

The reagents have the following reactions in the table below. These are the main things we look for when testing, however the kits are able to test for more substances then are listed in the table below. (the listed ones just include the most common things people come across)

The color reactions and associated positive results for 7 of the 8 reagents.

LSD and Other Indoles

In addition to these 7 reagents, an additional reagent, Erlichs reagent, can be used to identify “indoles,” which are broadly speaking, psychedelics. This category includes psyilocibn and LSD. Of particular importance in testing LSD and similar chemicals is identifying 25-I N-BOMe, a designer drug which mimics the effects of LSD quite closely, but can be lethal at higher doses (LSD has no confirmed overdoses and some users take high doses, which could present a threat if the chemical is 25-I and not actually LSD)

Cocaine and Levamisole / Amphetamines

Cocaine is often cut with other chemicals. Most notably, cocaine is often cut with amphetamine / methamphetamine and / or levamisole, a drug which cannot be easily separated from cocaine that can cause serious immunosuppressant complications in some users. The presence of levamisole and amphetamines can be detected through the use of the Marquis and Liebermann reagents.

Levamisole has been found in 70-80% of all cocaine. To err on the side of caution, assume that the cocaine you are ingesting contains levamisole. Watch our for symptoms of immunosuppression, and if possible, tell your doctor you are taking cocaine so they can help monitor your health.


Finally, it is very important to test for the presence of fentanyl, a powerful synthetic opioid that has caused many overdoses in recent years and has been found cut into drugs of all types. The instructions for testing for the presence of fentanyl are included below


Knowledge is power. When using recreational drugs, it is very important to know what you are ingesting. These reagents and fentanyl test strips can be purchased through dance safe at https://dancesafe.org/shop/

We at Seattle test it and dance safe want you to have access to drug checking services and make an effort to provide these to our community. Drug checking is held regularly at

The People’s Harm Reduction Alliance in the University District in Seattle on Fridays from 1-5pm

Stay Safe Seattle meetings every other Wednesday from 7:30-9:00pm

And via Seattle Test It on appointment (see our contact info)